Inside the Silicone band is a steel bar, it is thin and as shown in the photo it is straight, but when you slap it on your wrist, it will form around it and grip your wrist. Kids love them and these are great for parties! Round alloy case(34mm) inside, covered by silicone outer case slap the trap on wrist, it can roll along your wrist naturally(no buckle needed), Silicone outside for protection Japan quartz with precise timing, Runs on a Battery included and installed Items are new and will be sent in it''s plastic bag/wrapper The watches will fit Men Women and Children! One Size Fits Most. Will fit a wrist that is 2 1/4" round to 3 1/2". Since it is a Slap Watch it will fit around almost any wrist or ankle if you have a huge wrist like a Big Gulp cup it will still fit! Ships in a white gift box and is shrink wrapped ready to be gifted!